He played in five seasons with the Wheat Kings scoring 60 goals and 151 points in 205 games.

[2] Following the end of his junior year McCartney joined Arizona's American Hockey League (AHL) affiliate, the Tucson Roadrunners for the last four games of the season, making him the youngest player for the team in their history.

[3] During the 2021–22 season, McCartney scored the first of two hat tricks in a 4–0 win over the Texas Stars in the Roadrunners' home opener on October 23, 2021.

[6] He scored his second hat trick for Tucson in a 6–5 loss to the Colorado Eagles on April 16, 2022.

[3] He began the 2023–24 season with Tucson, but was recalled by Arizona on October 28, 2023.